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    <pre class="programlisting"><span class="comment">//</span>
<span class="comment">// timer.cpp</span>
<span class="comment">// ~~~~~~~~~</span>
<span class="comment">//</span>
<span class="comment">// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)</span>
<span class="comment">//</span>
<span class="comment">// Distributed under the Boost Software License, Version 1.0. (See accompanying</span>
<span class="comment">// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)</span>
<span class="comment">//</span>

<span class="special">#</span><span class="identifier">include</span> <span class="special">&lt;</span><span
                class="identifier">iostream</span><span class="special">&gt;</span>
<span class="special">#</span><span class="identifier">include</span> <span class="special">&lt;</span><span
                class="identifier">asio</span><span class="special">.</span><span class="identifier">hpp</span><span
                class="special">&gt;</span>
<span class="special">#</span><span class="identifier">include</span> <span class="special">&lt;</span><span
                class="identifier">boost</span><span class="special">/</span><span class="identifier">bind</span><span
                class="special">/</span><span class="identifier">bind</span><span class="special">.</span><span
                class="identifier">hpp</span><span class="special">&gt;</span>

<span class="keyword">class</span> <span class="identifier">printer</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="identifier">printer</span><span class="special">(</span><span class="identifier">asio</span><span
                class="special">::</span><span class="identifier">io_context</span><span
                class="special">&amp;</span> <span class="identifier">io</span><span class="special">)</span>
    <span class="special">:</span> <span class="identifier">strand_</span><span class="special">(</span><span
                class="identifier">asio</span><span class="special">::</span><span class="identifier">make_strand</span><span
                class="special">(</span><span class="identifier">io</span><span class="special">)),</span>
      <span class="identifier">timer1_</span><span class="special">(</span><span class="identifier">io</span><span
                class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">chrono</span><span class="special">::</span><span
                class="identifier">seconds</span><span class="special">(</span><span class="number">1</span><span
                class="special">)),</span>
      <span class="identifier">timer2_</span><span class="special">(</span><span class="identifier">io</span><span
                class="special">,</span> <span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">chrono</span><span class="special">::</span><span
                class="identifier">seconds</span><span class="special">(</span><span class="number">1</span><span
                class="special">)),</span>
      <span class="identifier">count_</span><span class="special">(</span><span class="number">0</span><span
                class="special">)</span>
  <span class="special">{</span>
    <span class="identifier">timer1_</span><span class="special">.</span><span class="identifier">async_wait</span><span
                class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">bind_executor</span><span class="special">(</span><span
                class="identifier">strand_</span><span class="special">,</span>
          <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span
                class="special">(&amp;</span><span class="identifier">printer</span><span class="special">::</span><span
                class="identifier">print1</span><span class="special">,</span> <span class="keyword">this</span><span
                class="special">)));</span>

    <span class="identifier">timer2_</span><span class="special">.</span><span class="identifier">async_wait</span><span
                class="special">(</span><span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">bind_executor</span><span class="special">(</span><span
                class="identifier">strand_</span><span class="special">,</span>
          <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span
                class="special">(&amp;</span><span class="identifier">printer</span><span class="special">::</span><span
                class="identifier">print2</span><span class="special">,</span> <span class="keyword">this</span><span
                class="special">)));</span>
  <span class="special">}</span>

  <span class="special">~</span><span class="identifier">printer</span><span class="special">()</span>
  <span class="special">{</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span
                class="special">&lt;&lt;</span> <span class="string">"Final count is "</span> <span class="special">&lt;&lt;</span> <span
                class="identifier">count_</span> <span class="special">&lt;&lt;</span> <span
                class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span
                class="special">;</span>
  <span class="special">}</span>

  <span class="keyword">void</span> <span class="identifier">print1</span><span class="special">()</span>
  <span class="special">{</span>
    <span class="keyword">if</span> <span class="special">(</span><span class="identifier">count_</span> <span
                class="special">&lt;</span> <span class="number">10</span><span class="special">)</span>
    <span class="special">{</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span
                class="special">&lt;&lt;</span> <span class="string">"Timer 1: "</span> <span
                class="special">&lt;&lt;</span> <span class="identifier">count_</span> <span
                class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span
                class="identifier">endl</span><span class="special">;</span>
      <span class="special">++</span><span class="identifier">count_</span><span class="special">;</span>

      <span class="identifier">timer1_</span><span class="special">.</span><span
                class="identifier">expires_at</span><span class="special">(</span><span
                class="identifier">timer1_</span><span class="special">.</span><span
                class="identifier">expiry</span><span class="special">()</span> <span class="special">+</span> <span
                class="identifier">asio</span><span class="special">::</span><span class="identifier">chrono</span><span
                class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span
                class="number">1</span><span class="special">));</span>

      <span class="identifier">timer1_</span><span class="special">.</span><span
                class="identifier">async_wait</span><span class="special">(</span><span
                class="identifier">asio</span><span class="special">::</span><span
                class="identifier">bind_executor</span><span class="special">(</span><span
                class="identifier">strand_</span><span class="special">,</span>
            <span class="identifier">boost</span><span class="special">::</span><span
                class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">printer</span><span
                class="special">::</span><span class="identifier">print1</span><span class="special">,</span> <span
                class="keyword">this</span><span class="special">)));</span>
    <span class="special">}</span>
  <span class="special">}</span>

  <span class="keyword">void</span> <span class="identifier">print2</span><span class="special">()</span>
  <span class="special">{</span>
    <span class="keyword">if</span> <span class="special">(</span><span class="identifier">count_</span> <span
                class="special">&lt;</span> <span class="number">10</span><span class="special">)</span>
    <span class="special">{</span>
      <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span
                class="special">&lt;&lt;</span> <span class="string">"Timer 2: "</span> <span
                class="special">&lt;&lt;</span> <span class="identifier">count_</span> <span
                class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span
                class="identifier">endl</span><span class="special">;</span>
      <span class="special">++</span><span class="identifier">count_</span><span class="special">;</span>

      <span class="identifier">timer2_</span><span class="special">.</span><span
                class="identifier">expires_at</span><span class="special">(</span><span
                class="identifier">timer2_</span><span class="special">.</span><span
                class="identifier">expiry</span><span class="special">()</span> <span class="special">+</span> <span
                class="identifier">asio</span><span class="special">::</span><span class="identifier">chrono</span><span
                class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span
                class="number">1</span><span class="special">));</span>

      <span class="identifier">timer2_</span><span class="special">.</span><span
                class="identifier">async_wait</span><span class="special">(</span><span
                class="identifier">asio</span><span class="special">::</span><span
                class="identifier">bind_executor</span><span class="special">(</span><span
                class="identifier">strand_</span><span class="special">,</span>
            <span class="identifier">boost</span><span class="special">::</span><span
                class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">printer</span><span
                class="special">::</span><span class="identifier">print2</span><span class="special">,</span> <span
                class="keyword">this</span><span class="special">)));</span>
    <span class="special">}</span>
  <span class="special">}</span>

<span class="keyword">private</span><span class="special">:</span>
  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">strand</span><span
                class="special">&lt;</span><span class="identifier">asio</span><span class="special">::</span><span
                class="identifier">io_context</span><span class="special">::</span><span class="identifier">executor_type</span><span
                class="special">&gt;</span> <span class="identifier">strand_</span><span class="special">;</span>
  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">steady_timer</span> <span
                class="identifier">timer1_</span><span class="special">;</span>
  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">steady_timer</span> <span
                class="identifier">timer2_</span><span class="special">;</span>
  <span class="keyword">int</span> <span class="identifier">count_</span><span class="special">;</span>
<span class="special">};</span>

<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
<span class="special">{</span>
  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_context</span> <span
                class="identifier">io</span><span class="special">;</span>
  <span class="identifier">printer</span> <span class="identifier">p</span><span class="special">(</span><span
                class="identifier">io</span><span class="special">);</span>
  <span class="identifier">asio</span><span class="special">::</span><span class="identifier">thread</span> <span
                class="identifier">t</span><span class="special">(</span><span class="identifier">boost</span><span
                class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span
                class="identifier">asio</span><span class="special">::</span><span
                class="identifier">io_context</span><span class="special">::</span><span
                class="identifier">run</span><span class="special">,</span> <span class="special">&amp;</span><span
                class="identifier">io</span><span class="special">));</span>
  <span class="identifier">io</span><span class="special">.</span><span class="identifier">run</span><span
                class="special">();</span>
  <span class="identifier">t</span><span class="special">.</span><span class="identifier">join</span><span
                class="special">();</span>

  <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>
</pre>
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            <div class="copyright-footer">Copyright © 2003-2022 Christopher M. Kohlhoff<p>
                Distributed under the Boost Software License, Version 1.0. (See accompanying
                file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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